Photocatalytic hydrogen production over carbon nitride loaded with WS2 as cocatalyst under visible light

摘要

Mesoporous graphitic$ carbon nitride (mpg-CN) was loaded with WS2 via an impregnation-sulfidation approach. The resultant surface heterojunctions between WS2 and mpg-CN were evidently confirmed with transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Photocat-alytic H2 production on WS2/mpg-CN under visible light (X >420 nm) shows that WS2 plays an important role in catalyzing H2 production. The rate of hydrogen evolution reaches an optimum when the loading amount of WS2 is about 0.3 at.%. Combined with the physicochemical and electrocatalytic properties of i WS2/mpg-CN, it can be concluded that the enhanced photocatalytic H2 production activity on WS2/mpg CN is mainly attributed to the thin layered junctions formed between WS2 and mpg-CN and the great performance of WS2 as a cocatalyst in H2 evolution reaction.